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I had exactly this error message. Traced it down to the
fact that my autoinstall kernel sees the first disk as
/dev/sda but the kernel in the image I'm installing uses
/dev/hdc (SATA drive -- weirdness in libata driver changes
in recent kernels)

My solution was to just call grub-install on /dev/sda
explicitly in my autoinstall script instead of relying on
"systemconfigurator --runboot"